#pragma once
#include <pthread.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <cstring>
#include <unistd.h>
#include <cstdlib>

#include "Log.hpp"

#define BACKLOG 5

class TcpServer
{
private:
    int _port;
    int _listen_sock;
    static TcpServer *_svr;

private:
    TcpServer(int port)
        : _port(port), _listen_sock(-1)
    {
    }
    TcpServer(const TcpServer &) = delete;
    TcpServer *operator=(const TcpServer &) = delete;

public:
    static TcpServer *GetInstance(int port)
    {
        pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
        if (_svr == nullptr)
        {
            pthread_mutex_lock(&lock);
            if (_svr == nullptr)
            {
                _svr = new TcpServer(port);
                _svr->InitServer();
            }
            pthread_mutex_unlock(&lock);
        }
        return _svr;
    }
    void InitServer()
    {
        Socket();
        Bind();
        Listen();
        LOG(INFO,"init TcpServer success");
    }

    void Socket()
    {   
        _listen_sock = socket(AF_INET, SOCK_STREAM, 0);
        if (_listen_sock < 0)
        {
            LOG(FATAL, "create socket error");
            exit(1);
        }
        int opt = 1;
        setsockopt(_listen_sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
        LOG(INFO, "create socket success");
    }
    void Bind()
    {
        struct sockaddr_in local;
        memset(&local,0,sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);
        local.sin_addr.s_addr = INADDR_ANY;
        socklen_t len = sizeof(local);
        if(bind(_listen_sock,(struct sockaddr*)&local,len)<0)
        {
            LOG(FATAL, "bind error");
            exit(2);
        }
        LOG(INFO, "bind socket success");
    }
    
    void Listen()
    {
        if (listen(_listen_sock, BACKLOG) < 0)
        {
            LOG(FATAL, "listen error");
            exit(3);
        }
        LOG(INFO, "listen socket success");
    }
    int Sock()
    {
        return _listen_sock;
    }
    ~TcpServer()
    {
        if (_listen_sock >= 0)
        {
            close(_listen_sock);
        }
    }
};
TcpServer *TcpServer::_svr = nullptr;